Procedure for Steering Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
decks lowered and off. Make sure engine is off and the
parking brake is applied.
Park machine on a level surface with the cutting
1
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
Figure 39
Steering circuit pressure test port
1.
3.
Connect a 5000 PSI (350 bar) pressure gauge onto
steering pressure test port.
4.
speed (2870 RPM).
Start the engine and move throttle to full engine
1
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
Holding the steering wheel against the stop for an
extended period can damage the steering valve.
5.
mentarily hold the steering wheel against resistance.
Turn steering all the way in one direction and mo-
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96
bar).
2
6.
7.
in control valve (Fig. 40). If relief valve is operating prop-
erly and if lift/lower problems also exist, gear pump
should be suspected ofwear and inefficiency. Ifsteering
wheel continues to turn at end of cylinder travel (with
lower than normal effort), steering cylinder or steering
valve should be suspected of wear or damage.
Stop the engine and record test results.
If pressure is incorrect, inspect steering relief valve
Figure 40
1.
Steering tower
2.
Steering relief valve
8.
When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4000--D
Page 4 -- 51
Hydraulic System
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